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4 USER GUIDE
4.7
Status and Communication Parameter Areas
This section details the status areas, which indicate the SV.LINK status, and the
communication parameter areas, which are required for communications with the MELSEC.
As the status and communication parameter areas, BD registers of from BD000 to BD03F are
used. The registers BD000 through BD03F are reserved for SV.LINK although some unused
areas are contained. When SV.LINK is used, do not use the above areas for any other
purposes.
Use the same areas (BD000 through BD03F) no matter whether the SV.LINK module is
defined as the main module or submodule.
The SV.LINK module checks for communication parameter rationality the moment the user
starts a communication process. If any communication parameter is in error, the SV.LINK
module does not start communications (the ERR LED glows and the module operation comes
to a stop).
(1) Status areas
The status areas store the error codes for errors that are caused during communications and
counts of the number of cyclic communications carried out since a reset/power-on reset.
Register
number
BD000
Error code
BD001
Cyclic communication counter
(count)
BD002
Reserved for future use
BD003
Reserved for future use
BD004
Reserved for future use
BD005
Reserved for future use
BD006
Reserved for future use
BD007
Reserved for future use
*1 If communication recovery is achieved through retries after the occurrence of a
communication error, the error code area is cleared to zero (0). In such an instance, the
previously encountered errors can be referenced by viewing the error code trace area. For
the error code trace area, see Section 6.3.3, "Communication error codes."
*2 This counter holds a count of the number of communications that have been carried out
since power ON. It is cleared to zero (0) when a power outage occurs.
Area name
Area description
Stores the error codes for errors that
are caused during communications.
While normal communications are
maintained, the value 0 is stored. For
detailed error code descriptions, see
Section 6.3.3, "Communication error
codes."
Holds a count of the number of
communications carried out with the
MELSEC.
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Remarks
*1
*2
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